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i2c.h

Last change on this file was 2, checked in by jglee, 11 years ago
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Rev	Line
[2]	1	/* ------------------------------------------------------------------------- */
	2	/* */
	3	/* i2c.h - definitions for the i2c-bus interface */
	4	/* */
	5	/* ------------------------------------------------------------------------- */
	6	/* Copyright (C) 1995-2000 Simon G. Vogl
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with this program; if not, write to the Free Software
	20	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
	21	/* ------------------------------------------------------------------------- */
	22
	23	/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
	24	Frodo Looijaard <frodol@dds.nl> */
	25
	26
	27	#ifndef _LINUX_I2C_H
	28	#define _LINUX_I2C_H
	29
	30	#include <linux/module.h>
	31	#include <linux/types.h>
	32	#include <linux/i2c-id.h>
	33	#include <linux/device.h> /* for struct device */
	34	#include <asm/semaphore.h>
	35
	36	/* --- General options ------------------------------------------------ */
	37
	38	struct i2c_msg;
	39	struct i2c_algorithm;
	40	struct i2c_adapter;
	41	struct i2c_client;
	42	struct i2c_driver;
	43	struct i2c_client_address_data;
	44	union i2c_smbus_data;
	45
	46	/*
	47	* The master routines are the ones normally used to transmit data to devices
	48	* on a bus (or read from them). Apart from two basic transfer functions to
	49	* transmit one message at a time, a more complex version can be used to
	50	* transmit an arbitrary number of messages without interruption.
	51	*/
	52	extern int i2c_master_send(struct i2c_client ,const char ,int);
	53	extern int i2c_master_recv(struct i2c_client ,char ,int);
	54
	55	/* Transfer num messages.
	56	*/
	57	extern int i2c_transfer(struct i2c_adapter adap, struct i2c_msg msgs, int num);
	58
	59	/*
	60	* Some adapter types (i.e. PCF 8584 based ones) may support slave behaviuor.
	61	* This is not tested/implemented yet and will change in the future.
	62	*/
	63	extern int i2c_slave_send(struct i2c_client ,char,int);
	64	extern int i2c_slave_recv(struct i2c_client ,char,int);
	65
	66
	67
	68	/* This is the very generalized SMBus access routine. You probably do not
	69	want to use this, though; one of the functions below may be much easier,
	70	and probably just as fast.
	71	Note that we use i2c_adapter here, because you do not need a specific
	72	smbus adapter to call this function. */
	73	extern __s32 i2c_smbus_xfer (struct i2c_adapter * adapter, __u16 addr,
	74	unsigned short flags,
	75	char read_write, __u8 command, int size,
	76	union i2c_smbus_data * data);
	77
	78	/* Now follow the 'nice' access routines. These also document the calling
	79	conventions of smbus_access. */
	80
	81	extern __s32 i2c_smbus_write_quick(struct i2c_client * client, __u8 value);
	82	extern __s32 i2c_smbus_read_byte(struct i2c_client * client);
	83	extern __s32 i2c_smbus_write_byte(struct i2c_client * client, __u8 value);
	84	extern __s32 i2c_smbus_read_byte_data(struct i2c_client * client, __u8 command);
	85	extern __s32 i2c_smbus_write_byte_data(struct i2c_client * client,
	86	__u8 command, __u8 value);
	87	extern __s32 i2c_smbus_read_word_data(struct i2c_client * client, __u8 command);
	88	extern __s32 i2c_smbus_write_word_data(struct i2c_client * client,
	89	__u8 command, __u16 value);
	90	/* Returns the number of bytes transferred */
	91	extern __s32 i2c_smbus_write_block_data(struct i2c_client * client,
	92	__u8 command, __u8 length,
	93	__u8 *values);
	94	extern __s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client,
	95	__u8 command, __u8 *values);
	96
	97	/*
	98	* A driver is capable of handling one or more physical devices present on
	99	* I2C adapters. This information is used to inform the driver of adapter
	100	* events.
	101	*/
	102
	103	struct i2c_driver {
	104	struct module *owner;
	105	char name[32];
	106	int id;
	107	unsigned int class;
	108	unsigned int flags; /* div., see below */
	109
	110	/* Notifies the driver that a new bus has appeared. This routine
	111	* can be used by the driver to test if the bus meets its conditions
	112	* & seek for the presence of the chip(s) it supports. If found, it
	113	* registers the client(s) that are on the bus to the i2c admin. via
	114	* i2c_attach_client.
	115	*/
	116	int (attach_adapter)(struct i2c_adapter );
	117	int (detach_adapter)(struct i2c_adapter );
	118
	119	/* tells the driver that a client is about to be deleted & gives it
	120	* the chance to remove its private data. Also, if the client struct
	121	* has been dynamically allocated by the driver in the function above,
	122	* it must be freed here.
	123	*/
	124	int (detach_client)(struct i2c_client );
	125
	126	/* a ioctl like command that can be used to perform specific functions
	127	* with the device.
	128	*/
	129	int (command)(struct i2c_client client,unsigned int cmd, void *arg);
	130
	131	struct device_driver driver;
	132	struct list_head list;
	133	};
	134	#define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
	135
	136	#define I2C_NAME_SIZE 50
	137
	138	/*
	139	* i2c_client identifies a single device (i.e. chip) that is connected to an
	140	* i2c bus. The behaviour is defined by the routines of the driver. This
	141	* function is mainly used for lookup & other admin. functions.
	142	*/
	143	struct i2c_client {
	144	unsigned int flags; /* div., see below */
	145	unsigned int addr; /* chip address - NOTE: 7bit */
	146	/* addresses are stored in the */
	147	/* _LOWER_ 7 bits of this char */
	148	/* addr: unsigned int to make lm_sensors i2c-isa adapter work
	149	more cleanly. It does not take any more memory space, due to
	150	alignment considerations */
	151	struct i2c_adapter adapter; / the adapter we sit on */
	152	struct i2c_driver driver; / and our access routines */
	153	int usage_count; /* How many accesses currently */
	154	/* to the client */
	155	struct device dev; /* the device structure */
	156	struct list_head list;
	157	char name[I2C_NAME_SIZE];
	158	struct completion released;
	159	};
	160	#define to_i2c_client(d) container_of(d, struct i2c_client, dev)
	161
	162	static inline void i2c_get_clientdata (struct i2c_client dev)
	163	{
	164	return dev_get_drvdata (&dev->dev);
	165	}
	166
	167	static inline void i2c_set_clientdata (struct i2c_client dev, void data)
	168	{
	169	dev_set_drvdata (&dev->dev, data);
	170	}
	171
	172	#define I2C_DEVNAME(str) .name = str
	173
	174	static inline char i2c_clientname(struct i2c_client c)
	175	{
	176	return &c->name[0];
	177	}
	178
	179	/*
	180	* The following structs are for those who like to implement new bus drivers:
	181	* i2c_algorithm is the interface to a class of hardware solutions which can
	182	* be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
	183	* to name two of the most common.
	184	*/
	185	struct i2c_algorithm {
	186	char name[32]; /* textual description */
	187	unsigned int id;
	188
	189	/* If an adapter algorithm can't do I2C-level access, set master_xfer
	190	to NULL. If an adapter algorithm can do SMBus access, set
	191	smbus_xfer. If set to NULL, the SMBus protocol is simulated
	192	using common I2C messages */
	193	int (master_xfer)(struct i2c_adapter adap,struct i2c_msg *msgs,
	194	int num);
	195	int (smbus_xfer) (struct i2c_adapter adap, __u16 addr,
	196	unsigned short flags, char read_write,
	197	__u8 command, int size, union i2c_smbus_data * data);
	198
	199	/* --- these optional/future use for some adapter types.*/
	200	int (slave_send)(struct i2c_adapter ,char*,int);
	201	int (slave_recv)(struct i2c_adapter ,char*,int);
	202
	203	/* --- ioctl like call to set div. parameters. */
	204	int (algo_control)(struct i2c_adapter , unsigned int, unsigned long);
	205
	206	/* To determine what the adapter supports */
	207	__u32 (functionality) (struct i2c_adapter );
	208	};
	209
	210	/*
	211	* i2c_adapter is the structure used to identify a physical i2c bus along
	212	* with the access algorithms necessary to access it.
	213	*/
	214	struct i2c_adapter {
	215	struct module *owner;
	216	unsigned int id;/* == is algo->id \| hwdep.struct->id, */
	217	/* for registered values see below */
	218	unsigned int class;
	219	struct i2c_algorithm algo;/ the algorithm to access the bus */
	220	void *algo_data;
	221
	222	/* --- administration stuff. */
	223	int (client_register)(struct i2c_client );
	224	int (client_unregister)(struct i2c_client );
	225
	226	/* data fields that are valid for all devices */
	227	struct semaphore bus_lock;
	228	struct semaphore clist_lock;
	229
	230	int timeout;
	231	int retries;
	232	struct device dev; /* the adapter device */
	233	struct class_device class_dev; /* the class device */
	234
	235	#ifdef CONFIG_PROC_FS
	236	/* No need to set this when you initialize the adapter */
	237	int inode;
	238	#endif /* def CONFIG_PROC_FS */
	239
	240	int nr;
	241	struct list_head clients;
	242	struct list_head list;
	243	char name[I2C_NAME_SIZE];
	244	struct completion dev_released;
	245	struct completion class_dev_released;
	246	};
	247	#define dev_to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
	248	#define class_dev_to_i2c_adapter(d) container_of(d, struct i2c_adapter, class_dev)
	249
	250	static inline void i2c_get_adapdata (struct i2c_adapter dev)
	251	{
	252	return dev_get_drvdata (&dev->dev);
	253	}
	254
	255	static inline void i2c_set_adapdata (struct i2c_adapter dev, void data)
	256	{
	257	dev_set_drvdata (&dev->dev, data);
	258	}
	259
	260	/flags for the driver struct: /
	261	#define I2C_DF_NOTIFY 0x01 /* notify on bus (de/a)ttaches */
	262	#if 0
	263	/* this flag is gone -- there is a (optional) driver->detach_adapter
	264	* callback now which can be used instead */
	265	# define I2C_DF_DUMMY 0x02
	266	#endif
	267
	268	/flags for the client struct: /
	269	#define I2C_CLIENT_ALLOW_USE 0x01 /* Client allows access */
	270	#define I2C_CLIENT_ALLOW_MULTIPLE_USE 0x02 /* Allow multiple access-locks */
	271	/* on an i2c_client */
	272	#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
	273	#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
	274	/* Must equal I2C_M_TEN below */
	275
	276	/* i2c adapter classes (bitmask) */
	277	#define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */
	278	#define I2C_CLASS_TV_ANALOG (1<<1) /* bttv + friends */
	279	#define I2C_CLASS_TV_DIGITAL (1<<2) /* dvb cards */
	280	#define I2C_CLASS_DDC (1<<3) /* i2c-matroxfb ? */
	281	#define I2C_CLASS_CAM_ANALOG (1<<4) /* camera with analog CCD */
	282	#define I2C_CLASS_CAM_DIGITAL (1<<5) /* most webcams */
	283	#define I2C_CLASS_SOUND (1<<6) /* sound devices */
	284	#define I2C_CLASS_ALL (UINT_MAX) /* all of the above */
	285
	286	/* i2c_client_address_data is the struct for holding default client
	287	* addresses for a driver and for the parameters supplied on the
	288	* command line
	289	*/
	290	struct i2c_client_address_data {
	291	unsigned short *normal_i2c;
	292	unsigned short *normal_i2c_range;
	293	unsigned short *probe;
	294	unsigned short *probe_range;
	295	unsigned short *ignore;
	296	unsigned short *ignore_range;
	297	unsigned short *force;
	298	};
	299
	300	/* Internal numbers to terminate lists */
	301	#define I2C_CLIENT_END 0xfffeU
	302	#define I2C_CLIENT_ISA_END 0xfffefffeU
	303
	304	/* The numbers to use to set I2C bus address */
	305	#define ANY_I2C_BUS 0xffff
	306	#define ANY_I2C_ISA_BUS 9191
	307
	308
	309	/* ----- functions exported by i2c.o */
	310
	311	/* administration...
	312	*/
	313	extern int i2c_add_adapter(struct i2c_adapter *);
	314	extern int i2c_del_adapter(struct i2c_adapter *);
	315
	316	extern int i2c_add_driver(struct i2c_driver *);
	317	extern int i2c_del_driver(struct i2c_driver *);
	318
	319	extern int i2c_attach_client(struct i2c_client *);
	320	extern int i2c_detach_client(struct i2c_client *);
	321
	322	/* New function: This is to get an i2c_client-struct for controlling the
	323	client either by using i2c_control-function or having the
	324	client-module export functions that can be used with the i2c_client
	325	-struct. */
	326	extern struct i2c_client *i2c_get_client(int driver_id, int adapter_id,
	327	struct i2c_client *prev);
	328
	329	/* Should be used with new function
	330	extern struct i2c_client i2c_get_client(int,int,struct i2c_client );
	331	to make sure that client-struct is valid and that it is okay to access
	332	the i2c-client.
	333	returns -EACCES if client doesn't allow use (default)
	334	returns -EBUSY if client doesn't allow multiple use (default) and
	335	usage_count >0 */
	336	extern int i2c_use_client(struct i2c_client *);
	337	extern int i2c_release_client(struct i2c_client *);
	338
	339	/* call the i2c_client->command() of all attached clients with
	340	* the given arguments */
	341	extern void i2c_clients_command(struct i2c_adapter *adap,
	342	unsigned int cmd, void *arg);
	343
	344	/* returns -EBUSY if address has been taken, 0 if not. Note that the only
	345	other place at which this is called is within i2c_attach_client; so
	346	you can cheat by simply not registering. Not recommended, of course! */
	347	extern int i2c_check_addr (struct i2c_adapter *adapter, int addr);
	348
	349	/* Detect function. It iterates over all possible addresses itself.
	350	* It will only call found_proc if some client is connected at the
	351	* specific address (unless a 'force' matched);
	352	*/
	353	extern int i2c_probe(struct i2c_adapter *adapter,
	354	struct i2c_client_address_data *address_data,
	355	int (found_proc) (struct i2c_adapter , int, int));
	356
	357	/* An ioctl like call to set div. parameters of the adapter.
	358	*/
	359	extern int i2c_control(struct i2c_client *,unsigned int, unsigned long);
	360
	361	/* This call returns a unique low identifier for each registered adapter,
	362	* or -1 if the adapter was not registered.
	363	*/
	364	extern int i2c_adapter_id(struct i2c_adapter *adap);
	365	extern struct i2c_adapter* i2c_get_adapter(int id);
	366	extern void i2c_put_adapter(struct i2c_adapter *adap);
	367
	368
	369	/* Return the functionality mask */
	370	static inline __u32 i2c_get_functionality(struct i2c_adapter *adap)
	371	{
	372	return adap->algo->functionality(adap);
	373	}
	374
	375	/* Return 1 if adapter supports everything we need, 0 if not. */
	376	static inline int i2c_check_functionality(struct i2c_adapter *adap, __u32 func)
	377	{
	378	return (func & i2c_get_functionality(adap)) == func;
	379	}
	380
	381	/*
	382	* I2C Message - used for pure i2c transaction, also from /dev interface
	383	*/
	384	struct i2c_msg {
	385	__u16 addr; /* slave address */
	386	__u16 flags;
	387	#define I2C_M_TEN 0x10 /* we have a ten bit chip address */
	388	#define I2C_M_RD 0x01
	389	#define I2C_M_NOSTART 0x4000
	390	#define I2C_M_REV_DIR_ADDR 0x2000
	391	#define I2C_M_IGNORE_NAK 0x1000
	392	#define I2C_M_NO_RD_ACK 0x0800
	393	__u16 len; /* msg length */
	394	__u8 buf; / pointer to msg data */
	395	};
	396
	397	/* To determine what functionality is present */
	398
	399	#define I2C_FUNC_I2C 0x00000001
	400	#define I2C_FUNC_10BIT_ADDR 0x00000002
	401	#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */
	402	#define I2C_FUNC_SMBUS_HWPEC_CALC 0x00000008 /* SMBus 2.0 */
	403	#define I2C_FUNC_SMBUS_READ_WORD_DATA_PEC 0x00000800 /* SMBus 2.0 */
	404	#define I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC 0x00001000 /* SMBus 2.0 */
	405	#define I2C_FUNC_SMBUS_PROC_CALL_PEC 0x00002000 /* SMBus 2.0 */
	406	#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL_PEC 0x00004000 /* SMBus 2.0 */
	407	#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */
	408	#define I2C_FUNC_SMBUS_QUICK 0x00010000
	409	#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
	410	#define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000
	411	#define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000
	412	#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000
	413	#define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000
	414	#define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000
	415	#define I2C_FUNC_SMBUS_PROC_CALL 0x00800000
	416	#define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000
	417	#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
	418	#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */
	419	#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */
	420	#define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 0x10000000 /* I2C-like block xfer */
	421	#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte reg. addr. */
	422	#define I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC 0x40000000 /* SMBus 2.0 */
	423	#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC 0x80000000 /* SMBus 2.0 */
	424
	425	#define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE \| \
	426	I2C_FUNC_SMBUS_WRITE_BYTE)
	427	#define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA \| \
	428	I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
	429	#define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA \| \
	430	I2C_FUNC_SMBUS_WRITE_WORD_DATA)
	431	#define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA \| \
	432	I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
	433	#define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK \| \
	434	I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
	435	#define I2C_FUNC_SMBUS_I2C_BLOCK_2 (I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 \| \
	436	I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2)
	437	#define I2C_FUNC_SMBUS_BLOCK_DATA_PEC (I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC \| \
	438	I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC)
	439	#define I2C_FUNC_SMBUS_WORD_DATA_PEC (I2C_FUNC_SMBUS_READ_WORD_DATA_PEC \| \
	440	I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC)
	441
	442	#define I2C_FUNC_SMBUS_READ_BYTE_PEC I2C_FUNC_SMBUS_READ_BYTE_DATA
	443	#define I2C_FUNC_SMBUS_WRITE_BYTE_PEC I2C_FUNC_SMBUS_WRITE_BYTE_DATA
	444	#define I2C_FUNC_SMBUS_READ_BYTE_DATA_PEC I2C_FUNC_SMBUS_READ_WORD_DATA
	445	#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA_PEC I2C_FUNC_SMBUS_WRITE_WORD_DATA
	446	#define I2C_FUNC_SMBUS_BYTE_PEC I2C_FUNC_SMBUS_BYTE_DATA
	447	#define I2C_FUNC_SMBUS_BYTE_DATA_PEC I2C_FUNC_SMBUS_WORD_DATA
	448
	449	#define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK \| \
	450	I2C_FUNC_SMBUS_BYTE \| \
	451	I2C_FUNC_SMBUS_BYTE_DATA \| \
	452	I2C_FUNC_SMBUS_WORD_DATA \| \
	453	I2C_FUNC_SMBUS_PROC_CALL \| \
	454	I2C_FUNC_SMBUS_WRITE_BLOCK_DATA \| \
	455	I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC \| \
	456	I2C_FUNC_SMBUS_I2C_BLOCK)
	457
	458	/*
	459	* Data for SMBus Messages
	460	*/
	461	#define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */
	462	#define I2C_SMBUS_I2C_BLOCK_MAX 32 /* Not specified but we use same structure */
	463	union i2c_smbus_data {
	464	__u8 byte;
	465	__u16 word;
	466	__u8 block[I2C_SMBUS_BLOCK_MAX + 3]; /* block[0] is used for length */
	467	/* one more for read length in block process call */
	468	/* and one more for PEC */
	469	};
	470
	471	/* smbus_access read or write markers */
	472	#define I2C_SMBUS_READ 1
	473	#define I2C_SMBUS_WRITE 0
	474
	475	/* SMBus transaction types (size parameter in the above functions)
	476	Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
	477	#define I2C_SMBUS_QUICK 0
	478	#define I2C_SMBUS_BYTE 1
	479	#define I2C_SMBUS_BYTE_DATA 2
	480	#define I2C_SMBUS_WORD_DATA 3
	481	#define I2C_SMBUS_PROC_CALL 4
	482	#define I2C_SMBUS_BLOCK_DATA 5
	483	#define I2C_SMBUS_I2C_BLOCK_DATA 6
	484	#define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */
	485	#define I2C_SMBUS_BLOCK_DATA_PEC 8 /* SMBus 2.0 */
	486	#define I2C_SMBUS_PROC_CALL_PEC 9 /* SMBus 2.0 */
	487	#define I2C_SMBUS_BLOCK_PROC_CALL_PEC 10 /* SMBus 2.0 */
	488	#define I2C_SMBUS_WORD_DATA_PEC 11 /* SMBus 2.0 */
	489
	490
	491	/* ----- commands for the ioctl like i2c_command call:
	492	* note that additional calls are defined in the algorithm and hw
	493	* dependent layers - these can be listed here, or see the
	494	* corresponding header files.
	495	*/
	496	/* -> bit-adapter specific ioctls */
	497	#define I2C_RETRIES 0x0701 /* number of times a device address */
	498	/* should be polled when not */
	499	/* acknowledging */
	500	#define I2C_TIMEOUT 0x0702 /* set timeout - call with int */
	501
	502
	503	/* this is for i2c-dev.c */
	504	#define I2C_SLAVE 0x0703 /* Change slave address */
	505	/* Attn.: Slave address is 7 or 10 bits */
	506	#define I2C_SLAVE_FORCE 0x0706 /* Change slave address */
	507	/* Attn.: Slave address is 7 or 10 bits */
	508	/* This changes the address, even if it */
	509	/* is already taken! */
	510	#define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */
	511
	512	#define I2C_FUNCS 0x0705 /* Get the adapter functionality */
	513	#define I2C_RDWR 0x0707 /* Combined R/W transfer (one stop only)*/
	514	#define I2C_PEC 0x0708 /* != 0 for SMBus PEC */
	515	#if 0
	516	#define I2C_ACK_TEST 0x0710 /* See if a slave is at a specific address */
	517	#endif
	518
	519	#define I2C_SMBUS 0x0720 /* SMBus-level access */
	520
	521	/* ... algo-bit.c recognizes */
	522	#define I2C_UDELAY 0x0705 /* set delay in microsecs between each */
	523	/* written byte (except address) */
	524	#define I2C_MDELAY 0x0706 /* millisec delay between written bytes */
	525
	526	/* ----- I2C-DEV: char device interface stuff ------------------------- */
	527
	528	#define I2C_MAJOR 89 /* Device major number */
	529
	530	/* These defines are used for probing i2c client addresses */
	531	/* The length of the option lists */
	532	#define I2C_CLIENT_MAX_OPTS 48
	533
	534	/* Default fill of many variables */
	535	#define I2C_CLIENT_DEFAULTS {I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	536	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	537	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	538	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	539	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	540	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	541	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	542	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	543	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	544	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	545	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	546	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	547	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	548	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	549	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
	550	I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END}
	551
	552	/* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the
	553	module header */
	554
	555	#define I2C_CLIENT_MODULE_PARM(var,desc) \
	556	static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \
	557	static unsigned int var##_num; \
	558	module_param_array(var, short, &var##_num, 0); \
	559	MODULE_PARM_DESC(var,desc)
	560
	561	/* This is the one you want to use in your own modules */
	562	#define I2C_CLIENT_INSMOD \
	563	I2C_CLIENT_MODULE_PARM(probe, \
	564	"List of adapter,address pairs to scan additionally"); \
	565	I2C_CLIENT_MODULE_PARM(probe_range, \
	566	"List of adapter,start-addr,end-addr triples to scan " \
	567	"additionally"); \
	568	I2C_CLIENT_MODULE_PARM(ignore, \
	569	"List of adapter,address pairs not to scan"); \
	570	I2C_CLIENT_MODULE_PARM(ignore_range, \
	571	"List of adapter,start-addr,end-addr triples not to " \
	572	"scan"); \
	573	I2C_CLIENT_MODULE_PARM(force, \
	574	"List of adapter,address pairs to boldly assume " \
	575	"to be present"); \
	576	static struct i2c_client_address_data addr_data = { \
	577	.normal_i2c = normal_i2c, \
	578	.normal_i2c_range = normal_i2c_range, \
	579	.probe = probe, \
	580	.probe_range = probe_range, \
	581	.ignore = ignore, \
	582	.ignore_range = ignore_range, \
	583	.force = force, \
	584	}
	585
	586	/* Detect whether we are on the isa bus. If this returns true, all i2c
	587	access will fail! */
	588	#define i2c_is_isa_client(clientptr) \
	589	((clientptr)->adapter->algo->id == I2C_ALGO_ISA)
	590	#define i2c_is_isa_adapter(adapptr) \
	591	((adapptr)->algo->id == I2C_ALGO_ISA)
	592
	593	#endif /* _LINUX_I2C_H */

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source: svn/trunk/newcon3bcm2_21bu/toolchain/mips-linux-uclibc/include/linux/i2c.h

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